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Selection and calculation of leaching tank

The main equipment in the cyanidation process includes learning to vent, washing equipment, precious liquid purification equipment and replacement equipment. The calculation of the selection of common equipment is briefly described below.
At present, the cyanide chemical used in China has a single impeller mechanical agitation tank, a double impeller hollow shaft intake mechanical agitation tank, an axial flow mechanical agitation tank and an air agitation tank (Pachuca tank). The structure of the single impeller mechanical agitation tank is the same as that of the slurry mixing tank for beneficiation . The volume is small and the installation power is large. The double impeller hollow shaft air intake mechanical agitation leaching tank has large volume and low power consumption. The hollow shaft intake can pass air. The impeller is better dispersed into the slurry to improve the leaching effect. The specifications and performance are shown in Table 1.
Table 1 SJ type double impeller leaching agitation tank
model
Specification performance
SJ-2×2.5
SJ-2.5×3.15
SJ-3.15×3.55
SJ-3.55×4
SJ-4×4.5
SJ-4.5×5
SJ-5×5.6
Diameter × height / mm
2000×2500
2500×3150
3150×3550
3550×4000
4000×4500
4500×5000
5000×5600
Effective volume / m 3
6
13
twenty one
34
48
72
98
Impeller speed / r · min -1
72
57
40.85
36.3
31.5
27.2
27.2
Pulp concentration /%
<45
<45
<45
<45
<45
<45
<45
Pulp density / t · m -3
≤1.4
≤1.4
≤1.4
≤1.4
≤1.4
≤1.4
≤1.4
Worm gear
Reducer
Model speed ratio
ZW-L
13.4
ZW-H
16.7
ZW-
.5
ZW-F
27.2
ZF-C
23.5
ZW-B
27.2
ZW-A
27.2
Electric motor
model
Power / kw
Rotating speed/
r·min -1
Y112M-6-B 3
2.2
940
Y112M-6-B 3 -
2.2
940
Y112M1-6-B 3
4
960
Y132M1-6-B 3
4
960
Y160M2-8-B 3
5.5
720
Y160M2-8-B 3
7.5
720
Y160L-8-B 3
7.5
720
Total equipment quality / kg
2800
3371
5628
6646
8285
10803
14430
The required volume of the leaching tank is calculated by the following formula
V=qt(R+1/ρ)/(24K) (1)
Where V is the total volume of the required leaching tank, m 3 ;
q——Daily processing ore, t/d;
T——the required leaching time, h;
Ρ——ore density, t/m 3 ;
R——leaching slurry ratio;
K——The utilization factor of the leaching tank volume is shown in Table 2.
Table 2 Leaching tank utilization factor K
materials
Leaching tank specification
Flotation gold concentrate
Full mud
Remarks
≤ф2500mm
0.8~0.83
<0.92
When the gold concentrate slurry system floats the foam, take a small value
30003000mm
0.83~0.86
0.92~0.93
≥ф3500mm
0.86~0.88
0.93~0.95
Select the size of the leaching tank based on the calculated total volume, and then calculate the number of slots. Generally, the number of leaching tanks should not be less than 3~4 units.
Then calculate the total air volume according to the venting tank inflation amount and wind pressure, select the pressure fan model, and then calculate the required number according to the required air volume and the rated air volume of the equipment. The leaching tank aeration and wind pressure are listed in Table 3.
Table 3 Leaching tank aeration and wind pressure
Leaching tank form
Aeration amount
Calculated pressure / kPa (kg / cm 2 )
According to the groove surface area / m 3 · m -2 · min -1
According to the tank volume / m 3 · m -3 · min -1
Mechanical agitation tank
0.1~0.2
58.8~147 (0.6~1.5)
Air mixing tank
0.15~0.2
0.13~0.025
245~343 (2.5~3.5)
Double impeller hollow suction air inlet agitation tank
0.002
98.1 (1.0)

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